A leading expert in motivation and personality psychology, Carol Dweck has discovered in more than twenty years of research that our mindset is not a minor personality quirk: it creates our whole mental world. It explains how we become optimistic or pessimistic. It shapes our goals, our attitude toward work and relationships, and how we raise our kids, ultimately predicting whether or not we will fulfill our potential. Dweck has found that everyone has one of two basic mindsets.